[BUG] [csharp] Uri parameter injection in Uri path escapes reserved Uri characters

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Valid and distinct urls such as "http://example.com/@test" get escaped to "http://example.com/%40test".

Referencing these 2 SO posts:
Must '@' and '%40' be treated equivalently in URL paths?
Can I use an at symbol (@) inside URLs?

It should output the url path with the reserved character unescaped.

openapi-generator version

7.0.1
Looks to be in 7.4 too.

OpenAPI declaration file content or url

Generation Details

"generatorName": "csharp",
"library": "httpclient",

Steps to reproduce

Generate any endpoint that injects into a path like "/bulk/{job_id}"
Call that endpoint on the client with an id that includes the '@' character.
Observe the outgoing http request from the generated client will be made to a url with the escaped '%40'

Related issues/PRs

I didn't see any.

Suggest a fix

Looking at the code, WebRequestPathBuilder uses Uri.EscapeDataString in the Uri Path section when it should be using Uri.EscapeUriString:

Start with modules/openapi-generator/src/main/resources/csharp/WebRequestPathBuilder.mustache and reproduce a generated csharp httpclient endpoint with a path parameter containing '@'. Compare the outgoing URL with the issue's expected unescaped path, and verify that reserved characters are handled correctly without changing unrelated path escaping.